I'll bet that at that level there are ways of paying less than the standard ~40-50% (or whatever the maximum tax rate is in Sweden) individual income tax.
E.g. I'll bet Bill Gates didn't personally pay (10s of) $billions in income taxes either.
That's correct. Gates would have been paying capital gains (rather than income taxes (except on his salary)), but has probably paid vast sums in taxes over time just due to the scale. He has shifted a lot of wealth from Microsoft stock holdings to his Cascade Investments. He holds roughly $20 billion in Microsoft, and $40 to $45 billion in Cascade. Gates would have paid a huge amount of capital gains taxes on that shift most likely (even if he managed to shield some or most of it; just 5% * $20 billion is still a billion in taxes).
Just as a side reference, the dividend and capital gains rate in Sweden is about 30%.
E.g. I'll bet Bill Gates didn't personally pay (10s of) $billions in income taxes either.